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Wireless power receiving apparatus

a power receiving apparatus and wireless technology, applied in the direction of circuit arrangements, electromagnetic wave systems, inductances, etc., can solve the problem of small power use efficiency, and achieve the effect of preventing voltage and preventing voltag

Active Publication Date: 2015-06-25
ADVANTEST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes an arrangement for improving the performance of a circuit that includes a reception antenna. The arrangement involves controlling the impedance of the load (which is the circuit's output) by turning on and off switches at specific times during a cycle. This control helps to reduce the time average of the impedance and prevent the voltage between the ends of the antenna from exceeding the breakdown voltage of the circuit. The technical effect of this arrangement is to improve the accuracy and reliability of the signal reception process.

Problems solved by technology

However, the power use efficiency thereof is small.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0061]FIG. 2 is a circuit diagram showing a configuration of the wireless power receiving apparatus 10 including the impedance control circuit 40 according to the first embodiment.

[0062]The impedance control circuit 40 includes a first switch SW1, a second switch SW2, and a switch control circuit 42.

[0063]The first switch SW1 is arranged between one terminal 22 of the reception antenna 20 and one terminal 32 of the load 30. The second switch SW2 is arranged between the aforementioned one terminal 22 and the other terminal 24 of the reception antenna 20. The first switch SW1 and the second switch SW2 may each be configured using a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), a bipolar transistor, an IGBT (Insulated Gate Bipolar Transistor), or the like. The first switch SW1 and the second switch SW2 may each be configured as a uni-directional switch or otherwise a bi-directional switch. The switch control circuit 42 controls the switching operations of the first switch...

second embodiment

[0082]FIG. 5 is a circuit diagram showing a configuration of a wireless power receiving apparatus 10a including an impedance control circuit 40a according to a second embodiment.

[0083]The impedance control circuit 40a includes a third switch SW3, an impedance element 44, and a switch control circuit 42a.

[0084]A third switch SW3 is arranged between one end 22 of the reception antenna 20 and one end 32 of the load 30. The third switch SW3 is configured as a uni-directional switch or otherwise a bi-directional switch. The third switch SW3 is configured using a MOSFET, a bipolar transistor, an IGET, or the like. The impedance element 44 is arranged between one end 22 of the reception antenna 20 and the other end 24.

[0085]The switch control circuit 42a controls the switching operation of the third switch SW3. The switch control circuit 42a is structured to change the ratio d of the on time TON of the third switch SW3 with respect to the period of the electric power signal S1, i.e., the ...

third embodiment

[0096]FIG. 7 is a circuit diagram showing a configuration of a wireless power receiving apparatus 10b including an impedance control circuit 40b according to a third embodiment.

[0097]The wireless power receiving apparatus 10b includes a first input line 45, a second input line 46, a first output line 47, a second output line 48, an H-bridge circuit 49, and a switch control circuit 42b.

[0098]The first input line 45 is connected to one end 22 of the reception antenna 20. The second input line 46 is connected to the other end 24 of the reception antenna 20. The first output line 47 is connected to one end 32 of the load 30. The second output line 48 is connected to the other end 34 of the load 30.

[0099]The H-bridge circuit 49 is connected to the first input line 45, the second input line 46, the first output line 47, and the second output line 48. The H-bridge circuit 49 rectifies the coil current IRX input to the input lines 45 and 46, and supplies the coil current IRX thus rectified...

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Abstract

A first switch is arranged between one end of a reception antenna and one end of a load. A second switch is arranged between the aforementioned one end of the reception antenna and the other end thereof. A switch control circuit controls switching on and off the first switch and the second switch. The switch control circuit is structured to change the ratio of the on time of the first switch with respect to the period of an electric power signal.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a wireless power supply technique.[0003]2. Description of the Related Art[0004]In recent years, wireless (contactless) power transmission has been receiving attention as a power supply technique for electronic devices such as cellular phone terminals, laptop computers, etc., or for electric vehicles. Wireless power transmission can be classified into three principal methods using an electromagnetic induction, an electromagnetic wave reception, and a magnetic resonance.[0005]The electromagnetic induction method is employed to supply electric power at a short range (several cm or less), which enables electric power of several hundred watts to be transmitted in a band that is equal to or lower than several hundred kHz. The power use efficiency thereof is on the order of 60% to 98%.[0006]In a case in which electric power is to be supplied over a relatively long range of several meters or mor...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02J17/00H02J5/00
CPCH02J5/005H02J17/00H02M7/219H02J50/12
Inventor ENDO, YUKIFURUKAWA, YASUO
Owner ADVANTEST CORP